1 /* 2 * Copyright (c) 1997, 1998 Kenneth D. Merry. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/types.h> 33 #include <sys/sysctl.h> 34 #include <sys/errno.h> 35 #include <sys/resource.h> 36 #include <sys/queue.h> 37 38 #include <ctype.h> 39 #include <err.h> 40 #include <fcntl.h> 41 #include <limits.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <stdarg.h> 46 #include <kvm.h> 47 48 #include "devstat.h" 49 50 typedef enum { 51 DEVSTAT_ARG_NOTYPE, 52 DEVSTAT_ARG_UINT64, 53 DEVSTAT_ARG_LD, 54 DEVSTAT_ARG_SKIP 55 } devstat_arg_type; 56 57 char devstat_errbuf[DEVSTAT_ERRBUF_SIZE]; 58 59 /* 60 * Table to match descriptive strings with device types. These are in 61 * order from most common to least common to speed search time. 62 */ 63 struct devstat_match_table match_table[] = { 64 {"da", DEVSTAT_TYPE_DIRECT, DEVSTAT_MATCH_TYPE}, 65 {"cd", DEVSTAT_TYPE_CDROM, DEVSTAT_MATCH_TYPE}, 66 {"scsi", DEVSTAT_TYPE_IF_SCSI, DEVSTAT_MATCH_IF}, 67 {"ide", DEVSTAT_TYPE_IF_IDE, DEVSTAT_MATCH_IF}, 68 {"other", DEVSTAT_TYPE_IF_OTHER, DEVSTAT_MATCH_IF}, 69 {"worm", DEVSTAT_TYPE_WORM, DEVSTAT_MATCH_TYPE}, 70 {"sa", DEVSTAT_TYPE_SEQUENTIAL,DEVSTAT_MATCH_TYPE}, 71 {"pass", DEVSTAT_TYPE_PASS, DEVSTAT_MATCH_PASS}, 72 {"optical", DEVSTAT_TYPE_OPTICAL, DEVSTAT_MATCH_TYPE}, 73 {"array", DEVSTAT_TYPE_STORARRAY, DEVSTAT_MATCH_TYPE}, 74 {"changer", DEVSTAT_TYPE_CHANGER, DEVSTAT_MATCH_TYPE}, 75 {"scanner", DEVSTAT_TYPE_SCANNER, DEVSTAT_MATCH_TYPE}, 76 {"printer", DEVSTAT_TYPE_PRINTER, DEVSTAT_MATCH_TYPE}, 77 {"floppy", DEVSTAT_TYPE_FLOPPY, DEVSTAT_MATCH_TYPE}, 78 {"proc", DEVSTAT_TYPE_PROCESSOR, DEVSTAT_MATCH_TYPE}, 79 {"comm", DEVSTAT_TYPE_COMM, DEVSTAT_MATCH_TYPE}, 80 {"enclosure", DEVSTAT_TYPE_ENCLOSURE, DEVSTAT_MATCH_TYPE}, 81 {NULL, 0, 0} 82 }; 83 84 struct devstat_args { 85 devstat_metric metric; 86 devstat_arg_type argtype; 87 } devstat_arg_list[] = { 88 { DSM_NONE, DEVSTAT_ARG_NOTYPE }, 89 { DSM_TOTAL_BYTES, DEVSTAT_ARG_UINT64 }, 90 { DSM_TOTAL_BYTES_READ, DEVSTAT_ARG_UINT64 }, 91 { DSM_TOTAL_BYTES_WRITE, DEVSTAT_ARG_UINT64 }, 92 { DSM_TOTAL_TRANSFERS, DEVSTAT_ARG_UINT64 }, 93 { DSM_TOTAL_TRANSFERS_READ, DEVSTAT_ARG_UINT64 }, 94 { DSM_TOTAL_TRANSFERS_WRITE, DEVSTAT_ARG_UINT64 }, 95 { DSM_TOTAL_TRANSFERS_OTHER, DEVSTAT_ARG_UINT64 }, 96 { DSM_TOTAL_BLOCKS, DEVSTAT_ARG_UINT64 }, 97 { DSM_TOTAL_BLOCKS_READ, DEVSTAT_ARG_UINT64 }, 98 { DSM_TOTAL_BLOCKS_WRITE, DEVSTAT_ARG_UINT64 }, 99 { DSM_KB_PER_TRANSFER, DEVSTAT_ARG_LD }, 100 { DSM_KB_PER_TRANSFER_READ, DEVSTAT_ARG_LD }, 101 { DSM_KB_PER_TRANSFER_WRITE, DEVSTAT_ARG_LD }, 102 { DSM_TRANSFERS_PER_SECOND, DEVSTAT_ARG_LD }, 103 { DSM_TRANSFERS_PER_SECOND_READ, DEVSTAT_ARG_LD }, 104 { DSM_TRANSFERS_PER_SECOND_WRITE, DEVSTAT_ARG_LD }, 105 { DSM_TRANSFERS_PER_SECOND_OTHER, DEVSTAT_ARG_LD }, 106 { DSM_MB_PER_SECOND, DEVSTAT_ARG_LD }, 107 { DSM_MB_PER_SECOND_READ, DEVSTAT_ARG_LD }, 108 { DSM_MB_PER_SECOND_WRITE, DEVSTAT_ARG_LD }, 109 { DSM_BLOCKS_PER_SECOND, DEVSTAT_ARG_LD }, 110 { DSM_BLOCKS_PER_SECOND_READ, DEVSTAT_ARG_LD }, 111 { DSM_BLOCKS_PER_SECOND_WRITE, DEVSTAT_ARG_LD }, 112 { DSM_MS_PER_TRANSACTION, DEVSTAT_ARG_LD }, 113 { DSM_MS_PER_TRANSACTION_READ, DEVSTAT_ARG_LD }, 114 { DSM_MS_PER_TRANSACTION_WRITE, DEVSTAT_ARG_LD }, 115 { DSM_SKIP, DEVSTAT_ARG_SKIP } 116 }; 117 118 static const char *namelist[] = { 119 #define X_NUMDEVS 0 120 "_devstat_num_devs", 121 #define X_GENERATION 1 122 "_devstat_generation", 123 #define X_VERSION 2 124 "_devstat_version", 125 #define X_DEVICE_STATQ 3 126 "_device_statq", 127 #define X_END 4 128 }; 129 130 /* 131 * Local function declarations. 132 */ 133 static int compare_select(const void *arg1, const void *arg2); 134 static int readkmem(kvm_t *kd, unsigned long addr, void *buf, size_t nbytes); 135 static int readkmem_nl(kvm_t *kd, const char *name, void *buf, size_t nbytes); 136 static char *get_devstat_kvm(kvm_t *kd); 137 138 #define KREADNL(kd, var, val) \ 139 readkmem_nl(kd, namelist[var], &val, sizeof(val)) 140 141 int 142 devstat_getnumdevs(kvm_t *kd) 143 { 144 size_t numdevsize; 145 int numdevs; 146 const char *func_name = "devstat_getnumdevs"; 147 148 numdevsize = sizeof(int); 149 150 /* 151 * Find out how many devices we have in the system. 152 */ 153 if (kd == NULL) { 154 if (sysctlbyname("kern.devstat.numdevs", &numdevs, 155 &numdevsize, NULL, 0) == -1) { 156 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 157 "%s: error getting number of devices\n" 158 "%s: %s", func_name, func_name, 159 strerror(errno)); 160 return(-1); 161 } else 162 return(numdevs); 163 } else { 164 165 if (KREADNL(kd, X_NUMDEVS, numdevs) == -1) 166 return(-1); 167 else 168 return(numdevs); 169 } 170 } 171 172 /* 173 * This is an easy way to get the generation number, but the generation is 174 * supplied in a more atmoic manner by the kern.devstat.all sysctl. 175 * Because this generation sysctl is separate from the statistics sysctl, 176 * the device list and the generation could change between the time that 177 * this function is called and the device list is retreived. 178 */ 179 long 180 devstat_getgeneration(kvm_t *kd) 181 { 182 size_t gensize; 183 long generation; 184 const char *func_name = "devstat_getgeneration"; 185 186 gensize = sizeof(long); 187 188 /* 189 * Get the current generation number. 190 */ 191 if (kd == NULL) { 192 if (sysctlbyname("kern.devstat.generation", &generation, 193 &gensize, NULL, 0) == -1) { 194 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 195 "%s: error getting devstat generation\n%s: %s", 196 func_name, func_name, strerror(errno)); 197 return(-1); 198 } else 199 return(generation); 200 } else { 201 if (KREADNL(kd, X_GENERATION, generation) == -1) 202 return(-1); 203 else 204 return(generation); 205 } 206 } 207 208 /* 209 * Get the current devstat version. The return value of this function 210 * should be compared with DEVSTAT_VERSION, which is defined in 211 * sys/devicestat.h. This will enable userland programs to determine 212 * whether they are out of sync with the kernel. 213 */ 214 int 215 devstat_getversion(kvm_t *kd) 216 { 217 size_t versize; 218 int version; 219 const char *func_name = "devstat_getversion"; 220 221 versize = sizeof(int); 222 223 /* 224 * Get the current devstat version. 225 */ 226 if (kd == NULL) { 227 if (sysctlbyname("kern.devstat.version", &version, &versize, 228 NULL, 0) == -1) { 229 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 230 "%s: error getting devstat version\n%s: %s", 231 func_name, func_name, strerror(errno)); 232 return(-1); 233 } else 234 return(version); 235 } else { 236 if (KREADNL(kd, X_VERSION, version) == -1) 237 return(-1); 238 else 239 return(version); 240 } 241 } 242 243 /* 244 * Check the devstat version we know about against the devstat version the 245 * kernel knows about. If they don't match, print an error into the 246 * devstat error buffer, and return -1. If they match, return 0. 247 */ 248 int 249 devstat_checkversion(kvm_t *kd) 250 { 251 const char *func_name = "devstat_checkversion"; 252 int buflen, res, retval = 0, version; 253 254 version = devstat_getversion(kd); 255 256 if (version != DEVSTAT_VERSION) { 257 /* 258 * If getversion() returns an error (i.e. -1), then it 259 * has printed an error message in the buffer. Therefore, 260 * we need to add a \n to the end of that message before we 261 * print our own message in the buffer. 262 */ 263 if (version == -1) 264 buflen = strlen(devstat_errbuf); 265 else 266 buflen = 0; 267 268 res = snprintf(devstat_errbuf + buflen, 269 DEVSTAT_ERRBUF_SIZE - buflen, 270 "%s%s: userland devstat version %d is not " 271 "the same as the kernel\n%s: devstat " 272 "version %d\n", version == -1 ? "\n" : "", 273 func_name, DEVSTAT_VERSION, func_name, version); 274 275 if (res < 0) 276 devstat_errbuf[buflen] = '\0'; 277 278 buflen = strlen(devstat_errbuf); 279 if (version < DEVSTAT_VERSION) 280 res = snprintf(devstat_errbuf + buflen, 281 DEVSTAT_ERRBUF_SIZE - buflen, 282 "%s: libdevstat newer than kernel\n", 283 func_name); 284 else 285 res = snprintf(devstat_errbuf + buflen, 286 DEVSTAT_ERRBUF_SIZE - buflen, 287 "%s: kernel newer than libdevstat\n", 288 func_name); 289 290 if (res < 0) 291 devstat_errbuf[buflen] = '\0'; 292 293 retval = -1; 294 } 295 296 return(retval); 297 } 298 299 /* 300 * Get the current list of devices and statistics, and the current 301 * generation number. 302 * 303 * Return values: 304 * -1 -- error 305 * 0 -- device list is unchanged 306 * 1 -- device list has changed 307 */ 308 int 309 devstat_getdevs(kvm_t *kd, struct statinfo *stats) 310 { 311 int error; 312 size_t dssize; 313 int oldnumdevs; 314 long oldgeneration; 315 int retval = 0; 316 struct devinfo *dinfo; 317 const char *func_name = "devstat_getdevs"; 318 struct timespec ts; 319 320 dinfo = stats->dinfo; 321 322 if (dinfo == NULL) { 323 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 324 "%s: stats->dinfo was NULL", func_name); 325 return(-1); 326 } 327 328 oldnumdevs = dinfo->numdevs; 329 oldgeneration = dinfo->generation; 330 331 clock_gettime(CLOCK_MONOTONIC, &ts); 332 stats->snap_time = ts.tv_sec + ts.tv_nsec * 1e-9; 333 334 if (kd == NULL) { 335 /* If this is our first time through, mem_ptr will be null. */ 336 if (dinfo->mem_ptr == NULL) { 337 /* 338 * Get the number of devices. If it's negative, it's an 339 * error. Don't bother setting the error string, since 340 * getnumdevs() has already done that for us. 341 */ 342 if ((dinfo->numdevs = devstat_getnumdevs(kd)) < 0) 343 return(-1); 344 345 /* 346 * The kern.devstat.all sysctl returns the current 347 * generation number, as well as all the devices. 348 * So we need four bytes more. 349 */ 350 dssize = (dinfo->numdevs * sizeof(struct devstat)) + 351 sizeof(long); 352 dinfo->mem_ptr = (u_int8_t *)malloc(dssize); 353 } else 354 dssize = (dinfo->numdevs * sizeof(struct devstat)) + 355 sizeof(long); 356 357 /* 358 * Request all of the devices. We only really allow for one 359 * ENOMEM failure. It would, of course, be possible to just go 360 * in a loop and keep reallocing the device structure until we 361 * don't get ENOMEM back. I'm not sure it's worth it, though. 362 * If devices are being added to the system that quickly, maybe 363 * the user can just wait until all devices are added. 364 */ 365 if ((error = sysctlbyname("kern.devstat.all", dinfo->mem_ptr, 366 &dssize, NULL, 0)) == -1) { 367 /* 368 * If we get ENOMEM back, that means that there are 369 * more devices now, so we need to allocate more 370 * space for the device array. 371 */ 372 if (errno == ENOMEM) { 373 /* 374 * No need to set the error string here, 375 * devstat_getnumdevs() will do that if it fails. 376 */ 377 if ((dinfo->numdevs = devstat_getnumdevs(kd)) < 0) 378 return(-1); 379 380 dssize = (dinfo->numdevs * 381 sizeof(struct devstat)) + sizeof(long); 382 dinfo->mem_ptr = (u_int8_t *) 383 realloc(dinfo->mem_ptr, dssize); 384 if ((error = sysctlbyname("kern.devstat.all", 385 dinfo->mem_ptr, &dssize, NULL, 0)) == -1) { 386 snprintf(devstat_errbuf, 387 sizeof(devstat_errbuf), 388 "%s: error getting device " 389 "stats\n%s: %s", func_name, 390 func_name, strerror(errno)); 391 return(-1); 392 } 393 } else { 394 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 395 "%s: error getting device stats\n" 396 "%s: %s", func_name, func_name, 397 strerror(errno)); 398 return(-1); 399 } 400 } 401 402 } else { 403 /* 404 * This is of course non-atomic, but since we are working 405 * on a core dump, the generation is unlikely to change 406 */ 407 if ((dinfo->numdevs = devstat_getnumdevs(kd)) == -1) 408 return(-1); 409 if ((dinfo->mem_ptr = get_devstat_kvm(kd)) == NULL) 410 return(-1); 411 } 412 /* 413 * The sysctl spits out the generation as the first four bytes, 414 * then all of the device statistics structures. 415 */ 416 dinfo->generation = *(long *)dinfo->mem_ptr; 417 418 /* 419 * If the generation has changed, and if the current number of 420 * devices is not the same as the number of devices recorded in the 421 * devinfo structure, it is likely that the device list has shrunk. 422 * The reason that it is likely that the device list has shrunk in 423 * this case is that if the device list has grown, the sysctl above 424 * will return an ENOMEM error, and we will reset the number of 425 * devices and reallocate the device array. If the second sysctl 426 * fails, we will return an error and therefore never get to this 427 * point. If the device list has shrunk, the sysctl will not 428 * return an error since we have more space allocated than is 429 * necessary. So, in the shrinkage case, we catch it here and 430 * reallocate the array so that we don't use any more space than is 431 * necessary. 432 */ 433 if (oldgeneration != dinfo->generation) { 434 if (devstat_getnumdevs(kd) != dinfo->numdevs) { 435 if ((dinfo->numdevs = devstat_getnumdevs(kd)) < 0) 436 return(-1); 437 dssize = (dinfo->numdevs * sizeof(struct devstat)) + 438 sizeof(long); 439 dinfo->mem_ptr = (u_int8_t *)realloc(dinfo->mem_ptr, 440 dssize); 441 } 442 retval = 1; 443 } 444 445 dinfo->devices = (struct devstat *)(dinfo->mem_ptr + sizeof(long)); 446 447 return(retval); 448 } 449 450 /* 451 * selectdevs(): 452 * 453 * Devices are selected/deselected based upon the following criteria: 454 * - devices specified by the user on the command line 455 * - devices matching any device type expressions given on the command line 456 * - devices with the highest I/O, if 'top' mode is enabled 457 * - the first n unselected devices in the device list, if maxshowdevs 458 * devices haven't already been selected and if the user has not 459 * specified any devices on the command line and if we're in "add" mode. 460 * 461 * Input parameters: 462 * - device selection list (dev_select) 463 * - current number of devices selected (num_selected) 464 * - total number of devices in the selection list (num_selections) 465 * - devstat generation as of the last time selectdevs() was called 466 * (select_generation) 467 * - current devstat generation (current_generation) 468 * - current list of devices and statistics (devices) 469 * - number of devices in the current device list (numdevs) 470 * - compiled version of the command line device type arguments (matches) 471 * - This is optional. If the number of devices is 0, this will be ignored. 472 * - The matching code pays attention to the current selection mode. So 473 * if you pass in a matching expression, it will be evaluated based 474 * upon the selection mode that is passed in. See below for details. 475 * - number of device type matching expressions (num_matches) 476 * - Set to 0 to disable the matching code. 477 * - list of devices specified on the command line by the user (dev_selections) 478 * - number of devices selected on the command line by the user 479 * (num_dev_selections) 480 * - Our selection mode. There are four different selection modes: 481 * - add mode. (DS_SELECT_ADD) Any devices matching devices explicitly 482 * selected by the user or devices matching a pattern given by the 483 * user will be selected in addition to devices that are already 484 * selected. Additional devices will be selected, up to maxshowdevs 485 * number of devices. 486 * - only mode. (DS_SELECT_ONLY) Only devices matching devices 487 * explicitly given by the user or devices matching a pattern 488 * given by the user will be selected. No other devices will be 489 * selected. 490 * - addonly mode. (DS_SELECT_ADDONLY) This is similar to add and 491 * only. Basically, this will not de-select any devices that are 492 * current selected, as only mode would, but it will also not 493 * gratuitously select up to maxshowdevs devices as add mode would. 494 * - remove mode. (DS_SELECT_REMOVE) Any devices matching devices 495 * explicitly selected by the user or devices matching a pattern 496 * given by the user will be de-selected. 497 * - maximum number of devices we can select (maxshowdevs) 498 * - flag indicating whether or not we're in 'top' mode (perf_select) 499 * 500 * Output data: 501 * - the device selection list may be modified and passed back out 502 * - the number of devices selected and the total number of items in the 503 * device selection list may be changed 504 * - the selection generation may be changed to match the current generation 505 * 506 * Return values: 507 * -1 -- error 508 * 0 -- selected devices are unchanged 509 * 1 -- selected devices changed 510 */ 511 int 512 devstat_selectdevs(struct device_selection **dev_select, int *num_selected, 513 int *num_selections, long *select_generation, 514 long current_generation, struct devstat *devices, 515 int numdevs, struct devstat_match *matches, int num_matches, 516 char **dev_selections, int num_dev_selections, 517 devstat_select_mode select_mode, int maxshowdevs, 518 int perf_select) 519 { 520 int i, j, k; 521 int init_selections = 0, init_selected_var = 0; 522 struct device_selection *old_dev_select = NULL; 523 int old_num_selections = 0, old_num_selected; 524 int selection_number = 0; 525 int changed = 0, found = 0; 526 527 if ((dev_select == NULL) || (devices == NULL) || (numdevs <= 0)) 528 return(-1); 529 530 /* 531 * We always want to make sure that we have as many dev_select 532 * entries as there are devices. 533 */ 534 /* 535 * In this case, we haven't selected devices before. 536 */ 537 if (*dev_select == NULL) { 538 *dev_select = (struct device_selection *)malloc(numdevs * 539 sizeof(struct device_selection)); 540 *select_generation = current_generation; 541 init_selections = 1; 542 changed = 1; 543 /* 544 * In this case, we have selected devices before, but the device 545 * list has changed since we last selected devices, so we need to 546 * either enlarge or reduce the size of the device selection list. 547 */ 548 } else if (*num_selections != numdevs) { 549 *dev_select = (struct device_selection *)realloc(*dev_select, 550 numdevs * sizeof(struct device_selection)); 551 *select_generation = current_generation; 552 init_selections = 1; 553 /* 554 * In this case, we've selected devices before, and the selection 555 * list is the same size as it was the last time, but the device 556 * list has changed. 557 */ 558 } else if (*select_generation < current_generation) { 559 *select_generation = current_generation; 560 init_selections = 1; 561 } 562 563 /* 564 * If we're in "only" mode, we want to clear out the selected 565 * variable since we're going to select exactly what the user wants 566 * this time through. 567 */ 568 if (select_mode == DS_SELECT_ONLY) 569 init_selected_var = 1; 570 571 /* 572 * In all cases, we want to back up the number of selected devices. 573 * It is a quick and accurate way to determine whether the selected 574 * devices have changed. 575 */ 576 old_num_selected = *num_selected; 577 578 /* 579 * We want to make a backup of the current selection list if 580 * the list of devices has changed, or if we're in performance 581 * selection mode. In both cases, we don't want to make a backup 582 * if we already know for sure that the list will be different. 583 * This is certainly the case if this is our first time through the 584 * selection code. 585 */ 586 if (((init_selected_var != 0) || (init_selections != 0) 587 || (perf_select != 0)) && (changed == 0)){ 588 old_dev_select = (struct device_selection *)malloc( 589 *num_selections * sizeof(struct device_selection)); 590 old_num_selections = *num_selections; 591 bcopy(*dev_select, old_dev_select, 592 sizeof(struct device_selection) * *num_selections); 593 } 594 595 if (init_selections != 0) { 596 bzero(*dev_select, sizeof(struct device_selection) * numdevs); 597 598 for (i = 0; i < numdevs; i++) { 599 (*dev_select)[i].device_number = 600 devices[i].device_number; 601 strncpy((*dev_select)[i].device_name, 602 devices[i].device_name, 603 DEVSTAT_NAME_LEN); 604 (*dev_select)[i].device_name[DEVSTAT_NAME_LEN - 1]='\0'; 605 (*dev_select)[i].unit_number = devices[i].unit_number; 606 (*dev_select)[i].position = i; 607 } 608 *num_selections = numdevs; 609 } else if (init_selected_var != 0) { 610 for (i = 0; i < numdevs; i++) 611 (*dev_select)[i].selected = 0; 612 } 613 614 /* we haven't gotten around to selecting anything yet.. */ 615 if ((select_mode == DS_SELECT_ONLY) || (init_selections != 0) 616 || (init_selected_var != 0)) 617 *num_selected = 0; 618 619 /* 620 * Look through any devices the user specified on the command line 621 * and see if they match known devices. If so, select them. 622 */ 623 for (i = 0; (i < *num_selections) && (num_dev_selections > 0); i++) { 624 char tmpstr[80]; 625 626 snprintf(tmpstr, sizeof(tmpstr), "%s%d", 627 (*dev_select)[i].device_name, 628 (*dev_select)[i].unit_number); 629 for (j = 0; j < num_dev_selections; j++) { 630 if (strcmp(tmpstr, dev_selections[j]) == 0) { 631 /* 632 * Here we do different things based on the 633 * mode we're in. If we're in add or 634 * addonly mode, we only select this device 635 * if it hasn't already been selected. 636 * Otherwise, we would be unnecessarily 637 * changing the selection order and 638 * incrementing the selection count. If 639 * we're in only mode, we unconditionally 640 * select this device, since in only mode 641 * any previous selections are erased and 642 * manually specified devices are the first 643 * ones to be selected. If we're in remove 644 * mode, we de-select the specified device and 645 * decrement the selection count. 646 */ 647 switch(select_mode) { 648 case DS_SELECT_ADD: 649 case DS_SELECT_ADDONLY: 650 if ((*dev_select)[i].selected) 651 break; 652 /* FALLTHROUGH */ 653 case DS_SELECT_ONLY: 654 (*dev_select)[i].selected = 655 ++selection_number; 656 (*num_selected)++; 657 break; 658 case DS_SELECT_REMOVE: 659 (*dev_select)[i].selected = 0; 660 (*num_selected)--; 661 /* 662 * This isn't passed back out, we 663 * just use it to keep track of 664 * how many devices we've removed. 665 */ 666 num_dev_selections--; 667 break; 668 } 669 break; 670 } 671 } 672 } 673 674 /* 675 * Go through the user's device type expressions and select devices 676 * accordingly. We only do this if the number of devices already 677 * selected is less than the maximum number we can show. 678 */ 679 for (i = 0; (i < num_matches) && (*num_selected < maxshowdevs); i++) { 680 /* We should probably indicate some error here */ 681 if ((matches[i].match_fields == DEVSTAT_MATCH_NONE) 682 || (matches[i].num_match_categories <= 0)) 683 continue; 684 685 for (j = 0; j < numdevs; j++) { 686 int num_match_categories; 687 688 num_match_categories = matches[i].num_match_categories; 689 690 /* 691 * Determine whether or not the current device 692 * matches the given matching expression. This if 693 * statement consists of three components: 694 * - the device type check 695 * - the device interface check 696 * - the passthrough check 697 * If a the matching test is successful, it 698 * decrements the number of matching categories, 699 * and if we've reached the last element that 700 * needed to be matched, the if statement succeeds. 701 * 702 */ 703 if ((((matches[i].match_fields & DEVSTAT_MATCH_TYPE)!=0) 704 && ((devices[j].device_type & DEVSTAT_TYPE_MASK) == 705 (matches[i].device_type & DEVSTAT_TYPE_MASK)) 706 &&(((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0) 707 || (((matches[i].match_fields & 708 DEVSTAT_MATCH_PASS) == 0) 709 && ((devices[j].device_type & 710 DEVSTAT_TYPE_PASS) == 0))) 711 && (--num_match_categories == 0)) 712 || (((matches[i].match_fields & DEVSTAT_MATCH_IF) != 0) 713 && ((devices[j].device_type & DEVSTAT_TYPE_IF_MASK) == 714 (matches[i].device_type & DEVSTAT_TYPE_IF_MASK)) 715 &&(((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0) 716 || (((matches[i].match_fields & 717 DEVSTAT_MATCH_PASS) == 0) 718 && ((devices[j].device_type & 719 DEVSTAT_TYPE_PASS) == 0))) 720 && (--num_match_categories == 0)) 721 || (((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0) 722 && ((devices[j].device_type & DEVSTAT_TYPE_PASS) != 0) 723 && (--num_match_categories == 0))) { 724 725 /* 726 * This is probably a non-optimal solution 727 * to the problem that the devices in the 728 * device list will not be in the same 729 * order as the devices in the selection 730 * array. 731 */ 732 for (k = 0; k < numdevs; k++) { 733 if ((*dev_select)[k].position == j) { 734 found = 1; 735 break; 736 } 737 } 738 739 /* 740 * There shouldn't be a case where a device 741 * in the device list is not in the 742 * selection list...but it could happen. 743 */ 744 if (found != 1) { 745 fprintf(stderr, "selectdevs: couldn't" 746 " find %s%d in selection " 747 "list\n", 748 devices[j].device_name, 749 devices[j].unit_number); 750 break; 751 } 752 753 /* 754 * We do different things based upon the 755 * mode we're in. If we're in add or only 756 * mode, we go ahead and select this device 757 * if it hasn't already been selected. If 758 * it has already been selected, we leave 759 * it alone so we don't mess up the 760 * selection ordering. Manually specified 761 * devices have already been selected, and 762 * they have higher priority than pattern 763 * matched devices. If we're in remove 764 * mode, we de-select the given device and 765 * decrement the selected count. 766 */ 767 switch(select_mode) { 768 case DS_SELECT_ADD: 769 case DS_SELECT_ADDONLY: 770 case DS_SELECT_ONLY: 771 if ((*dev_select)[k].selected != 0) 772 break; 773 (*dev_select)[k].selected = 774 ++selection_number; 775 (*num_selected)++; 776 break; 777 case DS_SELECT_REMOVE: 778 (*dev_select)[k].selected = 0; 779 (*num_selected)--; 780 break; 781 } 782 } 783 } 784 } 785 786 /* 787 * Here we implement "top" mode. Devices are sorted in the 788 * selection array based on two criteria: whether or not they are 789 * selected (not selection number, just the fact that they are 790 * selected!) and the number of bytes in the "bytes" field of the 791 * selection structure. The bytes field generally must be kept up 792 * by the user. In the future, it may be maintained by library 793 * functions, but for now the user has to do the work. 794 * 795 * At first glance, it may seem wrong that we don't go through and 796 * select every device in the case where the user hasn't specified 797 * any devices or patterns. In fact, though, it won't make any 798 * difference in the device sorting. In that particular case (i.e. 799 * when we're in "add" or "only" mode, and the user hasn't 800 * specified anything) the first time through no devices will be 801 * selected, so the only criterion used to sort them will be their 802 * performance. The second time through, and every time thereafter, 803 * all devices will be selected, so again selection won't matter. 804 */ 805 if (perf_select != 0) { 806 807 /* Sort the device array by throughput */ 808 qsort(*dev_select, *num_selections, 809 sizeof(struct device_selection), 810 compare_select); 811 812 if (*num_selected == 0) { 813 /* 814 * Here we select every device in the array, if it 815 * isn't already selected. Because the 'selected' 816 * variable in the selection array entries contains 817 * the selection order, the devstats routine can show 818 * the devices that were selected first. 819 */ 820 for (i = 0; i < *num_selections; i++) { 821 if ((*dev_select)[i].selected == 0) { 822 (*dev_select)[i].selected = 823 ++selection_number; 824 (*num_selected)++; 825 } 826 } 827 } else { 828 selection_number = 0; 829 for (i = 0; i < *num_selections; i++) { 830 if ((*dev_select)[i].selected != 0) { 831 (*dev_select)[i].selected = 832 ++selection_number; 833 } 834 } 835 } 836 } 837 838 /* 839 * If we're in the "add" selection mode and if we haven't already 840 * selected maxshowdevs number of devices, go through the array and 841 * select any unselected devices. If we're in "only" mode, we 842 * obviously don't want to select anything other than what the user 843 * specifies. If we're in "remove" mode, it probably isn't a good 844 * idea to go through and select any more devices, since we might 845 * end up selecting something that the user wants removed. Through 846 * more complicated logic, we could actually figure this out, but 847 * that would probably require combining this loop with the various 848 * selections loops above. 849 */ 850 if ((select_mode == DS_SELECT_ADD) && (*num_selected < maxshowdevs)) { 851 for (i = 0; i < *num_selections; i++) 852 if ((*dev_select)[i].selected == 0) { 853 (*dev_select)[i].selected = ++selection_number; 854 (*num_selected)++; 855 } 856 } 857 858 /* 859 * Look at the number of devices that have been selected. If it 860 * has changed, set the changed variable. Otherwise, if we've 861 * made a backup of the selection list, compare it to the current 862 * selection list to see if the selected devices have changed. 863 */ 864 if ((changed == 0) && (old_num_selected != *num_selected)) 865 changed = 1; 866 else if ((changed == 0) && (old_dev_select != NULL)) { 867 /* 868 * Now we go through the selection list and we look at 869 * it three different ways. 870 */ 871 for (i = 0; (i < *num_selections) && (changed == 0) && 872 (i < old_num_selections); i++) { 873 /* 874 * If the device at index i in both the new and old 875 * selection arrays has the same device number and 876 * selection status, it hasn't changed. We 877 * continue on to the next index. 878 */ 879 if (((*dev_select)[i].device_number == 880 old_dev_select[i].device_number) 881 && ((*dev_select)[i].selected == 882 old_dev_select[i].selected)) 883 continue; 884 885 /* 886 * Now, if we're still going through the if 887 * statement, the above test wasn't true. So we 888 * check here to see if the device at index i in 889 * the current array is the same as the device at 890 * index i in the old array. If it is, that means 891 * that its selection number has changed. Set 892 * changed to 1 and exit the loop. 893 */ 894 else if ((*dev_select)[i].device_number == 895 old_dev_select[i].device_number) { 896 changed = 1; 897 break; 898 } 899 /* 900 * If we get here, then the device at index i in 901 * the current array isn't the same device as the 902 * device at index i in the old array. 903 */ 904 else { 905 found = 0; 906 907 /* 908 * Search through the old selection array 909 * looking for a device with the same 910 * device number as the device at index i 911 * in the current array. If the selection 912 * status is the same, then we mark it as 913 * found. If the selection status isn't 914 * the same, we break out of the loop. 915 * Since found isn't set, changed will be 916 * set to 1 below. 917 */ 918 for (j = 0; j < old_num_selections; j++) { 919 if (((*dev_select)[i].device_number == 920 old_dev_select[j].device_number) 921 && ((*dev_select)[i].selected == 922 old_dev_select[j].selected)){ 923 found = 1; 924 break; 925 } 926 else if ((*dev_select)[i].device_number 927 == old_dev_select[j].device_number) 928 break; 929 } 930 if (found == 0) 931 changed = 1; 932 } 933 } 934 } 935 if (old_dev_select != NULL) 936 free(old_dev_select); 937 938 return(changed); 939 } 940 941 /* 942 * Comparison routine for qsort() above. Note that the comparison here is 943 * backwards -- generally, it should return a value to indicate whether 944 * arg1 is <, =, or > arg2. Instead, it returns the opposite. The reason 945 * it returns the opposite is so that the selection array will be sorted in 946 * order of decreasing performance. We sort on two parameters. The first 947 * sort key is whether or not one or the other of the devices in question 948 * has been selected. If one of them has, and the other one has not, the 949 * selected device is automatically more important than the unselected 950 * device. If neither device is selected, we judge the devices based upon 951 * performance. 952 */ 953 static int 954 compare_select(const void *arg1, const void *arg2) 955 { 956 if ((((const struct device_selection *)arg1)->selected) 957 && (((const struct device_selection *)arg2)->selected == 0)) 958 return(-1); 959 else if ((((const struct device_selection *)arg1)->selected == 0) 960 && (((const struct device_selection *)arg2)->selected)) 961 return(1); 962 else if (((const struct device_selection *)arg2)->bytes < 963 ((const struct device_selection *)arg1)->bytes) 964 return(-1); 965 else if (((const struct device_selection *)arg2)->bytes > 966 ((const struct device_selection *)arg1)->bytes) 967 return(1); 968 else 969 return(0); 970 } 971 972 /* 973 * Take a string with the general format "arg1,arg2,arg3", and build a 974 * device matching expression from it. 975 */ 976 int 977 devstat_buildmatch(char *match_str, struct devstat_match **matches, 978 int *num_matches) 979 { 980 char *tstr[5]; 981 char **tempstr; 982 int num_args; 983 int i, j; 984 const char *func_name = "devstat_buildmatch"; 985 986 /* We can't do much without a string to parse */ 987 if (match_str == NULL) { 988 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 989 "%s: no match expression", func_name); 990 return(-1); 991 } 992 993 /* 994 * Break the (comma delimited) input string out into separate strings. 995 */ 996 for (tempstr = tstr, num_args = 0; 997 (*tempstr = strsep(&match_str, ",")) != NULL && (num_args < 5); 998 num_args++) 999 if (**tempstr != '\0') 1000 if (++tempstr >= &tstr[5]) 1001 break; 1002 1003 /* The user gave us too many type arguments */ 1004 if (num_args > 3) { 1005 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 1006 "%s: too many type arguments", func_name); 1007 return(-1); 1008 } 1009 1010 /* 1011 * Since you can't realloc a pointer that hasn't been malloced 1012 * first, we malloc first and then realloc. 1013 */ 1014 if (*num_matches == 0) 1015 *matches = (struct devstat_match *)malloc( 1016 sizeof(struct devstat_match)); 1017 else 1018 *matches = (struct devstat_match *)realloc(*matches, 1019 sizeof(struct devstat_match) * (*num_matches + 1)); 1020 1021 /* Make sure the current entry is clear */ 1022 bzero(&matches[0][*num_matches], sizeof(struct devstat_match)); 1023 1024 /* 1025 * Step through the arguments the user gave us and build a device 1026 * matching expression from them. 1027 */ 1028 for (i = 0; i < num_args; i++) { 1029 char *tempstr2, *tempstr3; 1030 1031 /* 1032 * Get rid of leading white space. 1033 */ 1034 tempstr2 = tstr[i]; 1035 while (isspace(*tempstr2) && (*tempstr2 != '\0')) 1036 tempstr2++; 1037 1038 /* 1039 * Get rid of trailing white space. 1040 */ 1041 tempstr3 = &tempstr2[strlen(tempstr2) - 1]; 1042 1043 while ((*tempstr3 != '\0') && (tempstr3 > tempstr2) 1044 && (isspace(*tempstr3))) { 1045 *tempstr3 = '\0'; 1046 tempstr3--; 1047 } 1048 1049 /* 1050 * Go through the match table comparing the user's 1051 * arguments to known device types, interfaces, etc. 1052 */ 1053 for (j = 0; match_table[j].match_str != NULL; j++) { 1054 /* 1055 * We do case-insensitive matching, in case someone 1056 * wants to enter "SCSI" instead of "scsi" or 1057 * something like that. Only compare as many 1058 * characters as are in the string in the match 1059 * table. This should help if someone tries to use 1060 * a super-long match expression. 1061 */ 1062 if (strncasecmp(tempstr2, match_table[j].match_str, 1063 strlen(match_table[j].match_str)) == 0) { 1064 /* 1065 * Make sure the user hasn't specified two 1066 * items of the same type, like "da" and 1067 * "cd". One device cannot be both. 1068 */ 1069 if (((*matches)[*num_matches].match_fields & 1070 match_table[j].match_field) != 0) { 1071 snprintf(devstat_errbuf, 1072 sizeof(devstat_errbuf), 1073 "%s: cannot have more than " 1074 "one match item in a single " 1075 "category", func_name); 1076 return(-1); 1077 } 1078 /* 1079 * If we've gotten this far, we have a 1080 * winner. Set the appropriate fields in 1081 * the match entry. 1082 */ 1083 (*matches)[*num_matches].match_fields |= 1084 match_table[j].match_field; 1085 (*matches)[*num_matches].device_type |= 1086 match_table[j].type; 1087 (*matches)[*num_matches].num_match_categories++; 1088 break; 1089 } 1090 } 1091 /* 1092 * We should have found a match in the above for loop. If 1093 * not, that means the user entered an invalid device type 1094 * or interface. 1095 */ 1096 if ((*matches)[*num_matches].num_match_categories != (i + 1)) { 1097 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 1098 "%s: unknown match item \"%s\"", func_name, 1099 tstr[i]); 1100 return(-1); 1101 } 1102 } 1103 1104 (*num_matches)++; 1105 1106 return(0); 1107 } 1108 1109 /* 1110 * Compute a number of device statistics. Only one field is mandatory, and 1111 * that is "current". Everything else is optional. The caller passes in 1112 * pointers to variables to hold the various statistics he desires. If he 1113 * doesn't want a particular staistic, he should pass in a NULL pointer. 1114 * Return values: 1115 * 0 -- success 1116 * -1 -- failure 1117 */ 1118 int 1119 compute_stats(struct devstat *current, struct devstat *previous, 1120 long double etime, u_int64_t *total_bytes, 1121 u_int64_t *total_transfers, u_int64_t *total_blocks, 1122 long double *kb_per_transfer, long double *transfers_per_second, 1123 long double *mb_per_second, long double *blocks_per_second, 1124 long double *ms_per_transaction) 1125 { 1126 return(devstat_compute_statistics(current, previous, etime, 1127 total_bytes ? DSM_TOTAL_BYTES : DSM_SKIP, 1128 total_bytes, 1129 total_transfers ? DSM_TOTAL_TRANSFERS : DSM_SKIP, 1130 total_transfers, 1131 total_blocks ? DSM_TOTAL_BLOCKS : DSM_SKIP, 1132 total_blocks, 1133 kb_per_transfer ? DSM_KB_PER_TRANSFER : DSM_SKIP, 1134 kb_per_transfer, 1135 transfers_per_second ? DSM_TRANSFERS_PER_SECOND : DSM_SKIP, 1136 transfers_per_second, 1137 mb_per_second ? DSM_MB_PER_SECOND : DSM_SKIP, 1138 mb_per_second, 1139 blocks_per_second ? DSM_BLOCKS_PER_SECOND : DSM_SKIP, 1140 blocks_per_second, 1141 ms_per_transaction ? DSM_MS_PER_TRANSACTION : DSM_SKIP, 1142 ms_per_transaction, 1143 DSM_NONE)); 1144 } 1145 1146 1147 /* This is 1/2^64 */ 1148 #define BINTIME_SCALE 5.42101086242752217003726400434970855712890625e-20 1149 1150 long double 1151 devstat_compute_etime(struct bintime *cur_time, struct bintime *prev_time) 1152 { 1153 long double etime; 1154 1155 etime = cur_time->sec; 1156 etime += cur_time->frac * BINTIME_SCALE; 1157 if (prev_time != NULL) { 1158 etime -= prev_time->sec; 1159 etime -= prev_time->frac * BINTIME_SCALE; 1160 } 1161 return(etime); 1162 } 1163 1164 int 1165 devstat_compute_statistics(struct devstat *current, struct devstat *previous, 1166 long double etime, ...) 1167 { 1168 const char *func_name = "devstat_compute_statistics"; 1169 u_int64_t totalbytes, totalbytesread, totalbyteswrite; 1170 u_int64_t totaltransfers, totaltransfersread, totaltransferswrite; 1171 u_int64_t totaltransfersother, totalblocks, totalblocksread; 1172 u_int64_t totalblockswrite; 1173 va_list ap; 1174 devstat_metric metric; 1175 u_int64_t *destu64; 1176 long double *destld; 1177 int retval; 1178 1179 retval = 0; 1180 1181 /* 1182 * current is the only mandatory field. 1183 */ 1184 if (current == NULL) { 1185 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 1186 "%s: current stats structure was NULL", func_name); 1187 return(-1); 1188 } 1189 1190 totalbytesread = current->bytes[DEVSTAT_READ] - 1191 ((previous) ? previous->bytes[DEVSTAT_READ] : 0); 1192 totalbyteswrite = current->bytes[DEVSTAT_WRITE] - 1193 ((previous) ? previous->bytes[DEVSTAT_WRITE] : 0); 1194 1195 totalbytes = totalbytesread + totalbyteswrite; 1196 1197 totaltransfersread = current->operations[DEVSTAT_READ] - 1198 ((previous) ? previous->operations[DEVSTAT_READ] : 0); 1199 1200 totaltransferswrite = current->operations[DEVSTAT_WRITE] - 1201 ((previous) ? previous->operations[DEVSTAT_WRITE] : 0); 1202 1203 totaltransfersother = current->operations[DEVSTAT_NO_DATA] - 1204 ((previous) ? previous->operations[DEVSTAT_NO_DATA] : 0); 1205 1206 totaltransfers = totaltransfersread + totaltransferswrite + 1207 totaltransfersother; 1208 1209 totalblocks = totalbytes; 1210 totalblocksread = totalbytesread; 1211 totalblockswrite = totalbyteswrite; 1212 1213 if (current->block_size > 0) { 1214 totalblocks /= current->block_size; 1215 totalblocksread /= current->block_size; 1216 totalblockswrite /= current->block_size; 1217 } else { 1218 totalblocks /= 512; 1219 totalblocksread /= 512; 1220 totalblockswrite /= 512; 1221 } 1222 1223 va_start(ap, etime); 1224 1225 while ((metric = (devstat_metric)va_arg(ap, devstat_metric)) != 0) { 1226 1227 if (metric == DSM_NONE) 1228 break; 1229 1230 if (metric >= DSM_MAX) { 1231 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 1232 "%s: metric %d is out of range", func_name, 1233 metric); 1234 retval = -1; 1235 goto bailout; 1236 } 1237 1238 switch (devstat_arg_list[metric].argtype) { 1239 case DEVSTAT_ARG_UINT64: 1240 destu64 = (u_int64_t *)va_arg(ap, u_int64_t *); 1241 break; 1242 case DEVSTAT_ARG_LD: 1243 destld = (long double *)va_arg(ap, long double *); 1244 break; 1245 case DEVSTAT_ARG_SKIP: 1246 destld = (long double *)va_arg(ap, long double *); 1247 break; 1248 default: 1249 retval = -1; 1250 goto bailout; 1251 break; /* NOTREACHED */ 1252 } 1253 1254 if (devstat_arg_list[metric].argtype == DEVSTAT_ARG_SKIP) 1255 continue; 1256 1257 switch (metric) { 1258 case DSM_TOTAL_BYTES: 1259 *destu64 = totalbytes; 1260 break; 1261 case DSM_TOTAL_BYTES_READ: 1262 *destu64 = totalbytesread; 1263 break; 1264 case DSM_TOTAL_BYTES_WRITE: 1265 *destu64 = totalbyteswrite; 1266 break; 1267 case DSM_TOTAL_TRANSFERS: 1268 *destu64 = totaltransfers; 1269 break; 1270 case DSM_TOTAL_TRANSFERS_READ: 1271 *destu64 = totaltransfersread; 1272 break; 1273 case DSM_TOTAL_TRANSFERS_WRITE: 1274 *destu64 = totaltransferswrite; 1275 break; 1276 case DSM_TOTAL_TRANSFERS_OTHER: 1277 *destu64 = totaltransfersother; 1278 break; 1279 case DSM_TOTAL_BLOCKS: 1280 *destu64 = totalblocks; 1281 break; 1282 case DSM_TOTAL_BLOCKS_READ: 1283 *destu64 = totalblocksread; 1284 break; 1285 case DSM_TOTAL_BLOCKS_WRITE: 1286 *destu64 = totalblockswrite; 1287 break; 1288 case DSM_KB_PER_TRANSFER: 1289 *destld = totalbytes; 1290 *destld /= 1024; 1291 if (totaltransfers > 0) 1292 *destld /= totaltransfers; 1293 else 1294 *destld = 0.0; 1295 break; 1296 case DSM_KB_PER_TRANSFER_READ: 1297 *destld = totalbytesread; 1298 *destld /= 1024; 1299 if (totaltransfersread > 0) 1300 *destld /= totaltransfersread; 1301 else 1302 *destld = 0.0; 1303 break; 1304 case DSM_KB_PER_TRANSFER_WRITE: 1305 *destld = totalbyteswrite; 1306 *destld /= 1024; 1307 if (totaltransferswrite > 0) 1308 *destld /= totaltransferswrite; 1309 else 1310 *destld = 0.0; 1311 break; 1312 case DSM_TRANSFERS_PER_SECOND: 1313 if (etime > 0.0) { 1314 *destld = totaltransfers; 1315 *destld /= etime; 1316 } else 1317 *destld = 0.0; 1318 break; 1319 case DSM_TRANSFERS_PER_SECOND_READ: 1320 if (etime > 0.0) { 1321 *destld = totaltransfersread; 1322 *destld /= etime; 1323 } else 1324 *destld = 0.0; 1325 break; 1326 case DSM_TRANSFERS_PER_SECOND_WRITE: 1327 if (etime > 0.0) { 1328 *destld = totaltransferswrite; 1329 *destld /= etime; 1330 } else 1331 *destld = 0.0; 1332 break; 1333 case DSM_TRANSFERS_PER_SECOND_OTHER: 1334 if (etime > 0.0) { 1335 *destld = totaltransfersother; 1336 *destld /= etime; 1337 } else 1338 *destld = 0.0; 1339 break; 1340 case DSM_MB_PER_SECOND: 1341 *destld = totalbytes; 1342 *destld /= 1024 * 1024; 1343 if (etime > 0.0) 1344 *destld /= etime; 1345 else 1346 *destld = 0.0; 1347 break; 1348 case DSM_MB_PER_SECOND_READ: 1349 *destld = totalbytesread; 1350 *destld /= 1024 * 1024; 1351 if (etime > 0.0) 1352 *destld /= etime; 1353 else 1354 *destld = 0.0; 1355 break; 1356 case DSM_MB_PER_SECOND_WRITE: 1357 *destld = totalbyteswrite; 1358 *destld /= 1024 * 1024; 1359 if (etime > 0.0) 1360 *destld /= etime; 1361 else 1362 *destld = 0.0; 1363 break; 1364 case DSM_BLOCKS_PER_SECOND: 1365 *destld = totalblocks; 1366 if (etime > 0.0) 1367 *destld /= etime; 1368 else 1369 *destld = 0.0; 1370 break; 1371 case DSM_BLOCKS_PER_SECOND_READ: 1372 *destld = totalblocksread; 1373 if (etime > 0.0) 1374 *destld /= etime; 1375 else 1376 *destld = 0.0; 1377 break; 1378 case DSM_BLOCKS_PER_SECOND_WRITE: 1379 *destld = totalblockswrite; 1380 if (etime > 0.0) 1381 *destld /= etime; 1382 else 1383 *destld = 0.0; 1384 break; 1385 /* 1386 * This calculation is somewhat bogus. It simply divides 1387 * the elapsed time by the total number of transactions 1388 * completed. While that does give the caller a good 1389 * picture of the average rate of transaction completion, 1390 * it doesn't necessarily give the caller a good view of 1391 * how long transactions took to complete on average. 1392 * Those two numbers will be different for a device that 1393 * can handle more than one transaction at a time. e.g. 1394 * SCSI disks doing tagged queueing. 1395 * 1396 * The only way to accurately determine the real average 1397 * time per transaction would be to compute and store the 1398 * time on a per-transaction basis. That currently isn't 1399 * done in the kernel, and would only be desireable if it 1400 * could be implemented in a somewhat non-intrusive and high 1401 * performance way. 1402 */ 1403 case DSM_MS_PER_TRANSACTION: 1404 if (totaltransfers > 0) { 1405 *destld = etime; 1406 *destld /= totaltransfers; 1407 *destld *= 1000; 1408 } else 1409 *destld = 0.0; 1410 break; 1411 /* 1412 * As above, these next two really only give the average 1413 * rate of completion for read and write transactions, not 1414 * the average time the transaction took to complete. 1415 */ 1416 case DSM_MS_PER_TRANSACTION_READ: 1417 if (totaltransfersread > 0) { 1418 *destld = etime; 1419 *destld /= totaltransfersread; 1420 *destld *= 1000; 1421 } else 1422 *destld = 0.0; 1423 break; 1424 case DSM_MS_PER_TRANSACTION_WRITE: 1425 if (totaltransferswrite > 0) { 1426 *destld = etime; 1427 *destld /= totaltransferswrite; 1428 *destld *= 1000; 1429 } else 1430 *destld = 0.0; 1431 break; 1432 default: 1433 /* 1434 * This shouldn't happen, since we should have 1435 * caught any out of range metrics at the top of 1436 * the loop. 1437 */ 1438 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 1439 "%s: unknown metric %d", func_name, metric); 1440 retval = -1; 1441 goto bailout; 1442 break; /* NOTREACHED */ 1443 } 1444 } 1445 1446 bailout: 1447 1448 va_end(ap); 1449 return(retval); 1450 } 1451 1452 static int 1453 readkmem(kvm_t *kd, unsigned long addr, void *buf, size_t nbytes) 1454 { 1455 const char *func_name = "readkmem"; 1456 1457 if (kvm_read(kd, addr, buf, nbytes) == -1) { 1458 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 1459 "%s: error reading value (kvm_read): %s", func_name, 1460 kvm_geterr(kd)); 1461 return(-1); 1462 } 1463 return(0); 1464 } 1465 1466 static int 1467 readkmem_nl(kvm_t *kd, const char *name, void *buf, size_t nbytes) 1468 { 1469 const char *func_name = "readkmem_nl"; 1470 struct nlist nl[2]; 1471 1472 (const char *)nl[0].n_name = name; 1473 nl[1].n_name = NULL; 1474 1475 if (kvm_nlist(kd, nl) == -1) { 1476 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 1477 "%s: error getting name list (kvm_nlist): %s", 1478 func_name, kvm_geterr(kd)); 1479 return(-1); 1480 } 1481 return(readkmem(kd, nl[0].n_value, buf, nbytes)); 1482 } 1483 1484 /* 1485 * This duplicates the functionality of the kernel sysctl handler for poking 1486 * through crash dumps. 1487 */ 1488 static char * 1489 get_devstat_kvm(kvm_t *kd) 1490 { 1491 int error, i, wp; 1492 long gen; 1493 struct devstat *nds; 1494 struct devstat ds; 1495 struct devstatlist dhead; 1496 int num_devs; 1497 char *rv = NULL; 1498 const char *func_name = "get_devstat_kvm"; 1499 1500 if ((num_devs = devstat_getnumdevs(kd)) <= 0) 1501 return(NULL); 1502 error = 0; 1503 if (KREADNL(kd, X_DEVICE_STATQ, dhead) == -1) 1504 return(NULL); 1505 1506 nds = STAILQ_FIRST(&dhead); 1507 1508 if ((rv = malloc(sizeof(gen))) == NULL) { 1509 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 1510 "%s: out of memory (initial malloc failed)", 1511 func_name); 1512 return(NULL); 1513 } 1514 gen = devstat_getgeneration(kd); 1515 memcpy(rv, &gen, sizeof(gen)); 1516 wp = sizeof(gen); 1517 /* 1518 * Now push out all the devices. 1519 */ 1520 for (i = 0; (nds != NULL) && (i < num_devs); 1521 nds = STAILQ_NEXT(nds, dev_links), i++) { 1522 if (readkmem(kd, (long)nds, &ds, sizeof(ds)) == -1) { 1523 free(rv); 1524 return(NULL); 1525 } 1526 nds = &ds; 1527 rv = (char *)reallocf(rv, sizeof(gen) + 1528 sizeof(ds) * (i + 1)); 1529 if (rv == NULL) { 1530 snprintf(devstat_errbuf, sizeof(devstat_errbuf), 1531 "%s: out of memory (malloc failed)", 1532 func_name); 1533 return(NULL); 1534 } 1535 memcpy(rv + wp, &ds, sizeof(ds)); 1536 wp += sizeof(ds); 1537 } 1538 return(rv); 1539 } 1540